And Ruth said, Entreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Where thou diest, will I die, and there will I be buried.
Ruth 1:16-17
This subject has been popular in art for centuries. There's an Old Master at the Art and the Bible website, by Pieter Lastman ca. 1583–1633, entitled Ruth Declares her Loyalty to Naomi (1614). There's another in the Sudley House collection in Liverpool, by Ary Scheffer. William Blake got in on the act too:
Naomi entreating Ruth to follow Orpah (detail),
Illustration (1795) by William Blake (1757-1827)
Victoria and Albert Museum, London
There's also a sort of quasi-Classicist depiction of them by Thomas Williams Rooke, entitled "Naomi, Ruth and Obed" (1876): 
There's a nice modern drawing, unattributed, with Hebrew text:
This next one, from a blogpost entitled Ruth and Naomi: The Bible on Lesbians, is nice (and I like the pinky desert landscape). It looks as if they are just going to kiss...
Ruth and Naomi, Orpah departing, 1902
by Philip Hermogenes Calderon (1833-1898)
